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Chem. J. Chinese Universities

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Preparation of Au@SiO2 Core-shell Nanoparticles and Their Surface-Enhanced Raman Spectra

FAN Xiao-Min, ZOU Wen-Jun, GU Ren-Ao, YAO Jian-Lin*   

  1. Department of Chemistry and Chemical Engineering, Suzhou University, Suzhou 215123, China
  • Received:2007-07-05 Revised:1900-01-01 Online:2008-01-10 Published:2008-01-10
  • Contact: YAO Jian-Lin

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Abstract: Gold nanoparticles were prepared with chemical reduction method and the size was controlled via adjusting the molar ratio of citric acid to chloroauric acid. By measuring the TEOS and ammonia, the layer of SiO2 was attached onto gold nanoparticles with different thicknesses to produce Au@SiO2 core-shell nanoparticles. The relationship between the intensities of surface enhanced Raman spectroscopic(SERS) bands and the thickness of SiO2 was determined by employing thiophenol as the probe molecule. The results indicate that the electromagnetic enhancement(EM) was damped with the increase in the thickness of SiO2, and the damping effect was weaker that the dual-metal core-shell structure with the same size as the Au@SiO2. Moreover, the probe molecule was adsorbed onto the Au@SiO2 surface with physical interaction, and the probe was removed through the appropriate solvent for the cycle-SERS detection.

Key words: Au@SiO2 core-shell nanoparticle, Surface enhanced Raman spectroscopy, Electromagnetic enhancement

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